Manually Rotatable Tool

ABSTRACT

In one aspect of the present invention, a tool assembly comprises a rotary portion and a stationary portion. The rotary portion comprises a bolster bonded to a diamond symmetric, substantially conically shaped tip. The stationary portion comprises a block mounted to a driving mechanism. A compressible element is disposed intermediate and in mechanical contact with both the rotary and stationary portions. The compressible element is compressed sufficiently to restrict free rotation during a degradation operation.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation in-part of U.S. patent applicationSer. No. 12/177,556, which is a continuation-in-part of U.S. patent Ser.No. 12/135,595 which is a continuation in-part of U.S. patent Ser. No.12/112,743 which is a continuation in-part of U.S. patent applicationSer. No. 12/051,738 which is a continuation-in-part of U.S. patentapplication Ser. No. 12/051,689 which is a continuation of U.S. patentapplication Ser. No. 12/051,586 which is a continuation-in-part of U.S.patent application Ser. No. 12/021,051 which is a continuation-in-partof U.S. patent application Ser. No. 12/021,019 which was acontinuation-in-part of U.S. patent application Ser. No. 11/971,965which is a continuation of U.S. patent application Ser. No. 11/947,644,which was a continuation in-part of U.S. patent application Ser. No.11/844,586. U.S. patent application Ser. No. 11/844,586 is acontinuation in-part of U.S. patent application Ser. No. 11/829,761.U.S. patent application Ser. No. 11/829,761 is a continuation in-part ofU.S. patent application Ser. No. 11/773,271. U.S. patent applicationSer. No. 11/773,271 is a continuation-in-part of U.S. patent applicationSer. No. 11/766,903. U.S. patent application Ser. No. 11/766,903 is acontinuation of U.S. patent application Ser. No. 11/766,865. U.S. patentapplication Ser. No. 11/766,865 is a continuation-in-part of U.S. patentapplication Ser. No. 11/742,304. U.S. patent application Ser. No.11/742,304 is a continuation of U.S. patent application Ser. No.11/742,261. U.S. patent application Ser. No. 11/742,261 is acontinuation-in-part of U.S. patent application Ser. No. 11/464,008.U.S. patent application Ser. No. 11/464,008 is a continuation in-part ofU.S. patent application Ser. No. 11/463,998. U.S. patent applicationSer. No. 11/463,998 is a continuation-in-part of U.S. patent applicationSer. No. 11/463,990. U.S. patent application Ser. No. 11/463,990 is acontinuation in-part of U.S. patent application Ser. No. 11/463,975.U.S. patent application Ser. No. 11/463,975 is a continuation in-part ofU.S. patent application Ser. No. 11/463,962. U.S. patent applicationSer. No. 11/463,962 is a continuation in-part of U.S. patent applicationSer. No. 11/463,953. The present application is also acontinuation-in-part of U.S. patent application Ser. No. 11/695,672.U.S. patent application Ser. No. 11/695,672 is a continuation-in-part ofU.S. patent application Ser. No. 11/686,831. All of these applicationsare herein incorporated by reference for all that they contain.

BACKGROUND OF THE INVENTION

Formation degradation, such as drilling to form a well bore in theearth, pavement milling, mining, and/or excavating, may be performedusing degradation assemblies. In normal use, these assemblies andauxiliary equipment are subjected to high impact, heat, abrasion, andother environmental factors that wear their mechanical components. Manyefforts have been made to improve the service life of these assemblies.In some cases it is believed that the free rotation of the impact tip ofthe degradation assembly aides in lengthening the life of thedegradation assembly by promoting even wear of the assembly.

U.S. Pat. No. 5,261,499 to Grubb, which is herein incorporated byreference for all that it contains, discloses a two-piece rotatablecutting bit which comprises a shank and a nose. The shank has an axiallyforwardly projecting protrusion which carries a resilient spring clip.The protrusion and spring clip are received within a recess in the noseto rotatable attach the nose to the shank.

U.S. patent application Ser. No. 12/177,556 to Hall, et al., which isherein incorporated by reference for all that it contains discloses, adegradation assembly comprises a shank with a forward end and a rearwardend, the rearward end being adapted for attachment to a drivingmechanism, with a shield rotatably attached to the forward end of theshank. The shield comprises an underside adapted for rotatableattachment to the shank and an impact tip disposed on an end opposingthe underside. A seal is disposed intermediate the shield and the shank.

BRIEF SUMMARY OF THE INVENTION

In one aspect of the present invention, a tool assembly comprises arotary portion and a stationary portion. The rotary portion comprises abolster bonded to a diamond, symmetric, substantially conically shapedtip. The stationary portion comprises a block mounted to a drivingmechanism. A compressible element is disposed intermediate and inmechanical contact with both the rotary and stationary portions. Thecompressible element is compressed sufficiently to restrict freerotation during a degradation operation. In some embodiments, thecompressible element is compressed sufficiently enough to prevent freerotation. The tool assembly may be a degradation assembly.

In some embodiments, the compressible element comprises an o-ring under20%-40% compression. The o-ring may also comprise a hardness of 70-90durometers. The compression element may also act as a seal that retainslubricant within the assembly. The compression element may comprise anyof the following: at least one rubber ball, a compression spring, a setscrew, a non-round spring clip, a spring clip with at least one flatsurface, a press fit pin, or any combination thereof. A first rubbercompressible element may be disposed on the stationary portion and be incontact with a second rubber compressible element disposed on the rotaryportion.

In some embodiments, the rotary portion of the assembly may comprise apuller attachment and/or a wrench flat. The rotary portion may alsocomprise a shield, such that a recess of the shield is rotatablyconnected to a first end of the stationary portion. The bolster may alsowrap around a portion of the stationary portion.

In some embodiments, the compressible element may comprise a metallicmaterial. The compressible element may be part of a metal seal, which istight enough to prevent restrict or prevent free rotation.

In another aspect of the present invention the assembly may comprise aholder. The holder may be part of either the stationary or the rotaryportion of the assembly. The holder may comprise at least onlongitudinal slot.

In one aspect of the present invention, a degradation assembly comprisesa bolster intermediate a shank and a symmetric, substantially conicalshaped tip. The tip comprises a substrate bonded to a diamond material.The diamond comprises an apex coaxial with the tip, and the diamondbeing over 0.100 inches thick along the central axis of the tip. Theshank is inserted into a holder attached to a driving mechanism. Theassembly comprises a mechanical indexing arrangement, wherein the tipcomprises a definite number of azimuthal positions determined by themechanical indexing arrangement, each position orienting a differentazimuth of the tip such that the different azimuth impacts first duringan operation.

In some embodiments, the shank comprises substantially symmetriclongitudinal flat surfaces. The shank may axially comprise a hexagonalshape, a star shape, or any other axially symmetric shapes. The shankmay comprise and o-ring, a catch, a spring clip, or any combinationthereof. The tip may be rotationally isolated from the shank.

In some embodiments, the bolster may comprise a puller attachment. Thebolster may also be in communication with the driving mechanism througha press fit pin.

In some embodiments, the assembly may comprise a holder. The holder maybe indexible, and the holder may comprise a substantially axiallysymmetric geometry. The holder may be in communication with the shankthrough a thread form. The holder may also comprise a spring loadedcatch or a racketed cam.

In another aspect of the present invention, a method of utilizing adegradation assembly comprises, providing an degradation assemblycomprising a bolster intermediate a shank and a tip, the tip comprisinga substrate bonded to a diamond material comprising a symmetric,substantially conical shape, the diamond comprising an apex coaxial withthe tip, and the diamond being over 0.100 inches thick along the centralaxis of the tip. Then an operator actuates the driving mechanism for afirst period of time. Next, an operator rotates the degradation assemblyalong its central axis to another indexed azimuth. An operator thenactuates the driving mechanism for a second period of time.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional diagram of an embodiment of a pavementmilling machine.

FIG. 2 a is a cross-sectional and exploded diagram of an embodiment of adegradation assembly.

FIG. 2 b is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 3 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 3 b is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 4 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 4 b is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 5 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 5 b is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 6 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 6 b is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 7 is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 8 a is a perspective view of an embodiment of a snap ring.

FIG. 8 b is a top view of an embodiment of a snap ring.

FIG. 8 c is a perspective view of another embodiment of a snap ring.

FIG. 8 d is a top view of another embodiment of a snap ring.

FIG. 9 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 9 b is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 10 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 10 b is a perspective view of a diagram of another embodiment of adegradation assembly.

FIG. 11 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 11 b is a perspective view of a diagram of another embodiment of adegradation assembly.

FIG. 12 a is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 12 b is a cross-sectional diagram of another embodiment of adegradation assembly.

FIG. 13 is a flow chart of an embodiment of a method for manuallyrotating a degradation assembly.

DETAILED DESCRIPTION OF THE INVENTION AND THE PREFERRED EMBODIMENT

FIG. 1 is a cross-sectional diagram that shows a plurality ofdegradation assemblies 101 attached to a driving mechanism 102, such asa rotatable drum attached to the underside of a pavement milling machine103. The milling machine 103 may be an asphalt planer used to degrademanmade formations such as pavement 104 prior to placement of a newlayer of pavement. The degradation assemblies 101 may be attached to thedrum 102, bringing the degradation assemblies 101 into engagement withthe formation 104. The degradation assembly 101 may be disposed within ablock 105 welded or bolted to the drum attached to the driving mechanism102. A holder may be disposed intermediate the degradation assembly 101and the block 105. The block 105 may hold the degradation assembly 101at an angle offset from the direction of rotation, such that thedegradation assembly engages the formation 104 at a preferential angle.While an embodiment of a pavement milling machine 103 was used in theabove example, it should be understood that degradation assembliesdisclosed herein have a variety of uses and implementations that may notbe specifically discussed within this disclosure.

FIG. 2 a is a cross sectional exploded diagram of an embodiment of adegradation assembly 101. In this embodiment the degradation assembly101 comprises a rotary portion 200 in the form of a shield 201 and astationary portion 203 in the form of a shank 204. A conical diamond tip206 may be bonded to the shield 201. A compression element 208 in theform of an o-ring 205 may be adapted to be disposed intermediate theshield 201 and the shank 204. A spring clip 202 may also be adapted tobe disposed intermediate the shield 201 and the shank 204. The o-ringmay function as a grease barrier by maintaining grease intermediate theshield 201 and the shank 204.

The embodiment depicted in FIG. 2 b discloses a 20%-40% compressedo-ring 205. The o-ring 205 may be under enough compression that itreduces the cross sectional thickness of the o-ring by 20%-40%. Thespace between the shield 201 and shank 204 on the o-ring 205 may besmall enough to put the o-ring in such a compressed state. It isbelieved that an o-ring compressed by 20%-40% by the inner surface ofthe shield and outer surface of the shank may provide enough friction toprevent free rotation of the rotary portion of the assembly 101 duringdegradation operations. The o-ring 205 may comprise a hardness of 70-90durometers. The hardness of the o-ring 205 may influence the frictioncreated between the o-ring 205 and the assembly and may also influencethe durability and life of the o-ring 205. The o-ring may also functionas a seal to retain a lubricant intermediate the shield and the shank.In this embodiment the assembly 101 may be used in degradationoperations until the tip 206 begins to show uneven wear or for apredetermined time period. The assembly may then be manually rotatedsuch that a new azimuth of the tip is oriented to engage the formationfirst. A wrench flat 207 may be disposed on the rotary portion 200 ofthe assembly 101 to allow the rotary portion to be turned by a wrench.

The rotary portion 200 comprises a tip 206 comprising a cemented metalcarbide substrate 260 and a volume of sintered polycrystalline diamond261 forming a substantially conical geometry with a rounded apex. Thediamond 261 is preferably 0.100 to 0.250 inches thick from the apex tothe interface between the substrate 260 and diamond 261 through itscentral axis. The substrate 260 comprises a relatively short thickness,preferably less than the mentioned thickness of the diamond 261. A shortsubstrate 260 as identified may reduce the potential bending momentsexperienced by the substrate 260 during operation and therefore reducethe stress on the interface 262 between the substrate 260 and diamond261 as well as the braze joint 263 bonding the substrate 260 to therotary portion 200 of the assembly. Preferably, the substrate 260 isbrazed to cemented metal bolster 301 affixed to the shield 201. Theshank 204, bolster 301, and substrate 260 are preferably share a commoncentral axis.

The bolster 301 is preferably wider at its base than the largestdiameter of the substrate 260. However, preferably at the ir braze joint263, the surface of the substrate 260 is slightly larger than thesurface of the bolster. This may allow the substrate 260 to overhangslightly. The overhang may be small enough that it is not visible afterbrazing because braze material may extrude out filling the gap formed bythe overhang. While an overhang as small as described may seeminsignificant, improvement in field performance is contributed, in part,to it and is believed to further reduce stresses at the braze joint 263.

Preferably, the bolster 301 tapers from the interface with the substrate260 to a second interface with a steel portion of the shield 201. Atthis interface, the braze joint 263 is relieved at the center with asmall cavity 265 formed in the bolster 301. Also the thickness of thebraze increases closer to the periphery of the braze joint, which isbelieved to help absorb impact loads during operation. Also, the steelcurves around the corners of the bolster 301 at the second interface 264to reduce stress risers.

The bolster's 301 shape tapers from the first interface 263 to thesecond interface 264 with a slightly convex form. The largest crosssectional thickness of the bolster 301 is critical because thisthickness must be large enough to protect the steel beneath it as wellas spread the formation fragment apart for effective cutting.

The described bolster 301 and tip 206 combination have proven verysuccessful in the field. Many of the features described herein arecritical for a long lasting degradation assembly 101. In the prior art,the weakest part of the degradation assembly 101 is generally the impacttip 206, which fail first. The prior art attempts to improve the life ofthese weaker tips by rotating the tips 206 through a bearing usuallylocated between the inner surface of a holder bore and the outer surfaceof a shank 204. This rotation allows different azimuths of the tip 206to engage the formation at each impact, effectively distributing wearand impact damage around the entire circumference of the tip 206. In thepresent invention, however, the combination of the tip 206 and bolster301 is currently the most durable portion of the degradation assembly101. In fact, it is so durable, that at present the applicants have notbeen able to create a bearing capable of outlasting this combination. Inmost cases, the bearing will fail before the tip 206 or bolster 301receives enough wear or damage sufficient to replace them. At present,the tip 206 and bolster 301 combination is outlasting many of thecommercially sold milling teeth by at least a factor of ten.

The advantage of the rotary portion 200 with a bolster 301 and tip 206that is substantially prevented from rotating during operation asdescribed is an extended life of the overall degradation assembly 101.Rotating the rotary portion manually at predetermined times, or asdesired, allows the wear to be distributed around the tip 206 andbolster 301 as well.

The assemblies' longer life benefits operators by reducing down time toreplace worn assemblies and reducing replace part inventories.

FIG. 3 a is a cross sectional diagram depicting o-ring 205 disposedwithin a recess formed in the shank 204. The o-ring may still be underenough compression to substantially prevent the rotary portion'srotation. FIG. 3 b discloses a back up 350 also disposed within thegroove. The back up 350 may comprise a metal ring with at least onesubstantially slanted surface. The back up 350 may be placedintermediate the o-ring 205 and the shank 204. The back up 350 may aidin compressing the o-ring as well as protect it during assembly.

FIG. 4 a discloses an additional compressive element 306, which may alsobe an annular elastic element. The additional compressive element may bedisposed substantially within the stationary portion 203 adjacent thefirst compressive element, which is within the rotary portion. It isbelieved that the interaction between these two elements 208 maygenerate sufficient friction to prevent free rotation.

FIG. 4 b discloses a degradation assembly 101 with a rotary portion 200comprising an integral shank 302. The stationary portion 203 comprises aholder 303 with a bore adapted to rotational support the integral shank.A compressible element 208 in the form of at least one rubber ball 304is disposed intermediate the shank 302 and the holder 303. Thecompressible element may be a elastic ball, wedge, strip, block, square,blob, or combinations thereof. The assembly may also comprise an o-ring205 disposed intermediate the shank 302 and the holder 303. The o-ringmay function as a sealing element to retain lubricant within theassembly. It is believed that the at least one rubber ball 304 maysubstantially prevent the rotation. The assembly 101 may also comprisesa puller attachment 305 disposed on the bolster 301. The pullerattachment may be used to remove the rotary portion 200 of the assemblyfrom the holder 303.

FIG. 5 a discloses a compression spring 401 is disposed within theholder 303 such that a portion of the spring 401 engages the integralshank 302. It is believed that the compression spring 401 may put enoughpressure on the shank 302 to prevent free rotation of the rotary portion200.

FIG. 5 b discloses a press fit pin 402 as a compressible element 208. Itis believed that the press fit pin 402 is adjusted to put enoughpressure on the shank 302 of the rotary portion 200 to prevent freelrotation.

FIG. 6 a discloses a set screw 403 adapted to energize a compressibleelement 208.

FIG. 6 b discloses an outer edge of the rotary portion with an integralshank than wraps around a portion of the holder 303. A compressibleelement 208 in the form of a compressed o-ring 205 is disposed therebetween. The assembly may also comprise a snap ring 202 disposedintermediate the shank 302 and the holder 303. The snap ring 202 mayprevent the rotary portion 200 from separating from the stationaryportion 203.

FIG. 7 discloses a degradation assembly 101 disposed within a holder 303and a block 104. The rotary portion 200 comprises a bolster 301, a shank302, and a holder 303. The bolster 301 and the shank 302 are affixed toeach other. The shank 302 is in mechanical communication with the holder303 through a threadform 601. The block 104 comprises a bore 604 with aneck 605 where the bore 604 narrows. The holder 303 may comprise agroove 606 adapted to receive the neck 605 of the bore 604 and acompressible element 208 in the form of at least one slot 602. It isbelieved that the at least one slot 602 may allow the holder 303 totemporarily compress to allow the holder 303 to squeeze past the neck605 within the bore 604 of the block 104 until the neck 605 is seatedwithin the groove 606. After the neck 605 has been seated in the groove606 a portion 607 of the holder 303 comprising the slot 602 may occupy aportion of the bore 604 that is smaller than the natural circumferenceof the portion 607 of the holder 303. This may cause the portion 607 ofthe holder 303 to exert an outward force onto the inner wall 603 of theholder 303. It is believed that the force exerted by the portion 607 ofthe holder 303 onto the inner wall 603 of the bore 604 may prevent theassembly 101 from freely rotating but allow for manual rotation of theassembly 101.

FIGS. 8 a-8 d disclose different embodiment of snap rings 202 that maybe used as compressible elements 208 to prevent free rotation of anassembly 101 while still allowing for manual rotation. FIGS. 8 a and 8 bdisclose a snap ring 202 with an oval shape. When the snap ring isdisposed intermediate the shank and holder the oval shape is forced intoa circular shape causing a portion of the snap ring 202 to collapse ontothe shank and holder preventing the free rotation.

FIGS. 8 c and 8 d disclose a snap ring 202 with at least a flat side701. The flat side 701 may also prevent free rotation by collapsing onboth the shank and holder.

FIGS. 9 a and 9 b disclose rotationally indexible degradation assemblies101. The assembly comprises a holder 303 with a bore 802. The shank 302comprises longitudinal surfaces 801 complementary to those formed in thebore. FIG. 8 a discloses a the shank 302 with a hexagonal shape. Thebore 802 in the holder 303 comprises a corresponding hexagonal shape ofsubstantially the same proportions as the shank 302. The shank 302 isadapted to be inserted into the bore 802 of the holder 303 in sixdifferent orientations due to the hexagonal shape of the shank 302. Eachof the different positions may orient a different azimuth of the tip 206towards a working surface during operation. As one indexed locationbegins to wear the tip 206 the assembly 101 may be rotated to distributethe wear of the tip 206 to at another azimuth.

FIG. 9 b discloses a shank 302 and bore 802 of the holder 303 forming astar shape. This shape would allow for multiple azimuthal positions ofthe conical diamond tip 206.

FIGS. 10 a and 10 b disclose a rotationally indexible degradationassembly 101. A bolster 301 is intermediate a conical diamond tip 206and a shank 302. An o-ring 205 may be disposed around the shank 302. Theassembly may be disposed within a holder 303. The side of the bolster301 opposite the conical diamond tip 206 may comprise circumferentiallyequally spaced holes 901. These holes 901 may be adapted to receiveinterlocking elements 902. The holder 303 may comprise correspondingholes 901 adapted to receive interlocking elements 902. This embodimentmay be used in degradation operations until the conical diamond tip 206begins to show uneven wear at which time the rotary assembly may bedetached from the holder 303 by pulling the holder 303 and the bolster301 away from each other causing the press fit pins 902 to come out oftheir holes 901. The bolster may then be rotated until another set ofholes 901 align, the interlocking elements 902 are reinserted, and thenthe bolster 301 may be pressed onto the holder 303. In some embodiments,the interlocking elements are integral to with the stationary or rotaryportions of the assembly.

FIGS. 11 a and 11 b discloses a racketed cam system 1001 with a set ofindexible teeth 1002 disposed around the shank 302. The holder 303 maycomprise a tab 1003 adapted to interface with the indexible teeth 1002on the shank 302. The tab 1003 and the teeth 1002 may interact in such away that the tab only allows for the teeth 1003 to rotate in a singledirection. The tab 1003 may also interfere with the single direction ofrotation enough as to prevent free rotation of the assembly 101 while inuse.

FIG. 12 a discloses a rotary portion that comprises the conical diamondtip 206 and a shield 201. The stationary portion of the assembly maycomprise the shank 302. The shank 302 may comprises equallycircumferentially spaced flat surfaces 1102 adapted to receive a setscrew 1101. As a conical diamond tip 206 begins to wear the set screw1102 may be loosened, the shield 201 rotated, and the screw 1102 reset.

FIG. 12 b discloses an indexible holder 1201 that comprises axial flats.In this embodiment, the holder comprises a hexagonal shape. When theassembly 101 begins to show uneven wear the holder 1201 may be removedfrom a block, rotated, and then reinserted.

FIG. 13 is a flow chart of a method for rotating a degradation assemblyto another index point to lengthen the life of the assembly. The stepsinclude providing an degradation assembly comprising a bolsterintermediate a shank and a tip, the tip comprising a substrate bonded toa diamond material comprising a substantially conical shape, the diamondcomprising an apex coaxial with the tip, and the diamond being over0.100 inches thick 1301. The assembly may then be put into use byactuating the driving mechanism for a first period of time 1302. Oncethe assembly shows enough uneven wear, the next step includes stoppingthe driving mechanism and rotating the degradation assembly to anotherindex point 1303. The degradation process is restarted by actuating thedriving mechanism for a second period of time 1304.

Whereas the present invention has been described in particular relationto the drawings attached hereto, it should be understood that other andfurther modifications apart from those shown or suggested herein, may bemade within the scope and spirit of the present invention.

1. A tool assembly, comprising: a rotary portion and a stationaryportion; the rotary portion comprising a bolster bonded to a tip; thetip comprising a substrate bonded to a diamond material comprising asymmetric, substantially conical shape; the stationary portioncomprising a block mounted to a driving mechanism; and a compressibleelement disposed intermediate and in mechanical contact with the rotaryand stationary portions; wherein the compressible element is compressedsufficiently to restrict free rotation during a degradation operation.2. The assembly of claim 1, wherein the compression element comprises ano-ring under 20-40% compression.
 3. The assembly of claim 1, wherein thecompression element comprises an o-ring of 70-90 durometers.
 4. Theassembly of claim 1, wherein the compression element comprises ano-ring.
 5. The assembly of claim 1, wherein the compression elementcomprises a seal that retains lubricant within the assembly.
 6. Theassembly of claim 1, wherein the rotary portion comprises a pullerattachment.
 7. The assembly of claim 1, wherein the rotary portioncomprises a wrench flat.
 8. The assembly of claim 1, wherein thecompression element comprises at least one rubber ball disposed in acavity intermediate the stationary and the rotary portions.
 9. Theassembly of claim 1, wherein the compressible element is a non-roundspring clip is disposed intermediate the stationary and the rotaryportions.
 10. The assembly of claim 9, wherein a spring clip comprisingat least one substantially flat surface is disposed intermediate thestationary and the rotary portions.
 11. The assembly of claim 1, whereinthe stationary portion is in communication with the rotary portionthrough a set screw.
 12. The assembly of claim 1, wherein a compressionspring is disposed within the stationary portion.
 13. The assembly ofclaim 1, wherein an outer edge of the bolster wraps around a portion ofthe stationary portion.
 14. The assembly of claim 1, wherein the rotaryportion comprises a shield, such that a recess of the shield rotatablyconnected to a first end of the stationary portion; and the first end ofthe stationary portion comprising a shank disposed within the block. 15.The assembly of claim 1, wherein the rotary portion comprises a holder.16. The assembly of claim 15, wherein the holder comprises at least onelongitudinal slot.
 17. The assembly of claim 1, wherein the stationaryportion comprises a holder.
 18. The assembly of claim 1, wherein a firstrubber compressible element is disposed on the stationary portion and isin contact with a second rubber compressible element disposed on therotary portion.
 19. The assembly of claim 1, wherein the compressibleelement comprises a press fit pin.
 20. The assembly of claim 1, whereinthe assembly comprises a back up adjacent to the o-ring.